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United States Patent | 5,757,357 |
Grande ,   et al. | May 26, 1998 |
A system and method for process instrumentation and control equipment. The system including a paperless, microprocessor-based, panelboard recorder having built-in data acquisition functions, a mechanism for archiving data, and a variety of display types. Memory space is conserved by deriving quantized data comprising signal samples received at a first rate and storing them for a first relatively short period in a fine quantized memory, and storing in a coarse memory, for a longer period of time, a subset of said signal samples recurring at a rate lower than the first set and having fewer quantized levels than the first set of samples. The operator can then determine whether coarse data obtained over a relatively long period or fine data obtained over a shorter period are displayed.
Inventors: | Grande; Mark J. (Horsham, PA); Maisenhelder, III; Howard (Roslyn, PA) |
Assignee: | Moore Products Co. (Spring House, PA) |
Appl. No.: | 268497 |
Filed: | June 30, 1994 |
Current U.S. Class: | 345/440.1; 324/121R |
Intern'l Class: | G09G 005/00 |
Field of Search: | 345/134,127,131 73/866.3 324/113,121 R,379,394 364/237.7,921.8,178,179,182,188,189,413.05,413.06,550 |
4197590 | Apr., 1980 | Sukonick et al. | 364/900. |
4734869 | Mar., 1988 | Mickowski | 364/550. |
4967381 | Oct., 1990 | Lane et al. | 364/551. |
5146550 | Sep., 1992 | Furter et al. | 395/140. |
5178010 | Jan., 1993 | Holzel | 73/384. |
5179639 | Jan., 1993 | Taaffe | 395/128. |
5261031 | Nov., 1993 | Saito | 395/140. |
5280422 | Jan., 1994 | Moe et al. | 364/140. |
5311451 | May., 1994 | Barrett | 364/550. |